Central Air and Heating Not Working
(port st lucie, florida, usa)
I live in Florida where it gets cold about 1 month/ yr. I've been in my house with a Lennox indoor air handler/outdoor fan/pump unit for 5 yrs without any issues. Its gotten cold (30s) the past 3 nights. 1st night, everything went well; heater came on/off with no problems.
2nd night, the heater began blowing cold air at about 8pm and ran constant blowing cold until 2am, when it magically began working, heated up the house and ran fine throughout the morning/ day. I had an ac service come out to check it.
They said it was fine but tried selling me a larger unit.
Night 3, the heat cut out around 10pm and continuously blew cold the remainder of the night (down to 59 degrees in my house currently at 6 am, despite a thermostat setting of 72). Again the vents are putting out cool air nonstop. Any suggestions or solutions?